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# Third Grade ◆ Lesson One

Mass creates form, which occupies space and brings into being a spatial articulation.

Social structure, culture and the built environment have a direct influence on one another.

# MATERIALS

• 1.

Drawings comparing English and metric lengths of some common objects (included).

• 2.

The English and metric ruler (included). Photocopy to the exact size shown and cut out for each student.

4.

Metric system

5

.

Millimeter

• 1.

Centimeter

• 2.

Kilometer

• 3.

Meter

# ACTIVITy

• A.

The teacher gives students a brief history of the metric system by explaining the following:

• 1.

The metric system began in the 1200s in England as a method for measuring length, volume, temperature, time, and weight or mass.

• 2.

Most countries other than the U.S. use the metric system today; the U.S. uses a system called the “customary” or “ English” system.

• 3.

Early in the 1970s, Canada began to convert from the “customary” or “English” system to the metric system.

• 4.

In 1975, the U.S. Congress passed the Metric Conversion Act, calling for a voluntary change over to a system of metric measurement.

• 5.

The metric system is based on units of “ten” and is simple to use.

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Lesson 1

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